Unable to control themselves, some teenagers get hooked by online games, __________(这成了老师和家长始终担心的事).

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问题 Unable to control themselves, some teenagers get hooked by online games, __________(这成了老师和家长始终担心的事).

选项

答案which is a constant worry to teachers and parents

解析 ① which引导非限定性定语从句。② constant表示“始终的,不断的”。要特别提示的是从前后文来看,该句后半句是对前半句的进一步解释和说明,前半句后使用了逗号,故判定要用非限定性定语从句,用which引导,不能用that。
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